AT&T 2500 series, 7500 series, 7100 series manual 28PUBLIC and Private Data Network Connections

8-28PUBLIC AND PRIVATE DATA NETWORK CONNECTIONS

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5.Also, supports 64-kbps 3270C/PC-PBX connections.

6.Older data modules (such as the DTDM, 7404 data module, and 7406 and 7407 data stands), can be used for Mode 2 connections.

7.Only the System 85 R2V4, the Generic 1, and Generic 2 support ISDN-PRI.

8.The System 85 (R2V3) will not support dedicated data connections.

9.At mode 0, the MPDM and 7500B cannot be used to communicate with each other.

10.The 7500B can only be used with the Generic 2 communications system.

11.If the facility is restricted and the MPDM is used, then the customer’s DTE must not generate an all ones octet. DTEs that use HDLC satisfy this requirement.

DTE

MPDM/M1*

S75/S85	DS1 WITH
	ROBBED
G1/G2	BIT

PRIVATE	DS1 WITH
DATA	ROBBED
NETWORK	BIT

D4*

DSU

DTE

* DAA-OCU supports signaling for switched applications. OCU-56 is non-signaling for dedicated line applications.

Figure 8-18.Private Data Network with Robbed Bit Facilities and D4 Connection at Far End (Mode 1)

DTE

DATA

MODULE

	24th	PRIVATE	24th
S75/S85	CHANNEL	DATA	CHANNEL	S75/S85
G1/G2		NETWORK		G1/G2

DATA

MODULE

DTE

Figure 8-19.Private Data Network with 24th Channel or ISDN-PRI Signaling (Modes 0, 1, 2, 3)

DTE

DATA

MODULE

S75/S85 ISDN-PRI G1/G2

PRIVATE

DATA ISDN-PRI S75/S85

NETWORKG1/G2

DATA

MODULE

DTE

Figure 8-20.Private Data Network with 24th Channel or ISDN-PRI Signaling (Modes 0, 1, 2, 3)